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Free42 is a re-implementation of the HP-42S calculator and the HP-82240 printer.It is a complete rewrite, not using any HP code, and it does not require anHP-42S ROM image. Free42 is an Open Source project. The executables and sourcecode are released under the terms of the GNU General Public License, version 2.All third-party code used in Free42 is either in the public domain, or licensed under terms compatible with GPLv2, or used with the authors' permission.